US 11,788,552 B2Granted

Rotary machine with cooling jacket including helical groove

OwnerKuniaki Iizuka, Yuji Sasaki +6inventors

InventorsKuniaki Iizuka, Yuji Sasaki, Tatsumi Inomata, Ryosuke Yumoto, Kai Iijima, Tatsuya Fukui, Hikaru Sugiura, Yoshihito Katsu

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Abstract

An example rotary machine includes a motor including a rotor and a stator, and a cooling jacket disposed around the stator. The cooling jacket includes an inner body part being cylindrical and in contact with the stator, an outer body part being cylindrical and surrounding the inner body part, and a groove through which a cooling medium passes, the groove circling helically around an outer circumference of the inner body part at least once. The groove has a pair of side surfaces opposed in a direction of an axis of rotation of the rotor, and a bottom surface connected to each of the pair of side surfaces. Each of the pair of side surfaces is formed having a draft angle inclined away from each other, the draft angle inclined relative to a release direction orthogonal to the axis of rotation.

Claims16

Dependent claims

A rotary machine comprising:

a motor including a rotor and a stator;
and
a cooling jacket disposed around the stator, wherein the cooling jacket includes:
a cylindrical inner body part in contact with the stator and comprising an outer circumferential surface that defines an outer diameter of the inner body part;
a cylindrical outer body part surrounding the inner body part;
and
a helical groove formed in the outer circumferential surface of the inner body part and configured to transmit a cooling medium, the helical groove circling helically at an oblique angle around the inner body part a plurality of times,
wherein the helical groove includes a pair of side surfaces opposed to each other in a direction of an axis of rotation of the rotor and a bottom surface, the pair of side surfaces connected to and extending from the bottom surface of the helical groove to the outer circumferential surface of the inner body part,
wherein the inner body part has a virtual region being cylindrical about the axis of rotation, the virtual region having an outer diameter bounded by the bottom surface of the helical groove,
wherein each of the side surfaces is formed having a draft angle that is inclined away from each other, the draft angle determined relative to a direction orthogonal to the axis of rotation, and
wherein the draft angle is larger than the oblique angle of the helical groove and is derived using formula (1) under the condition of formula (2),
[
Formula
⁢
⁢
1
]
atan
⁡
[
(
D
⁢
⁢
1
-
D
⁢
⁢
2
)
/
2
⁢
⁢
tan
⁢
⁢
S
D
⁢
⁢
1
/
2
⁢
⁢
sin
⁢
{
acos
⁡
(
D
⁢
⁢
2
/
D
⁢
⁢
1
)
}
]
atan
⁡
(
P
π
⁢
⁢
D
⁢
⁢
1
)
>
1
⁢
[
Formula
⁢
⁢
2
]
(
1
)
(
D
⁢
⁢
1
-
D
⁢
⁢
2
)
⁢
tan
⁢
⁢
S
+
B
<
P
(
2
)
where S is the draft angle, D1 is the outer diameter of the inner body part, D2 is the outer diameter of the virtual region, P is an array pitch of the helical groove in the direction of the axis of rotation, and B is a width of the bottom surface in the direction of the axis of rotation.

110 more elements

A rotary machine comprising:

a motor including a rotor and a stator;
and
a cooling jacket disposed around the stator, wherein the cooling jacket includes:
a cylindrical inner body part in contact with the stator and comprising an outer circumferential surface that defines an outer diameter of the inner body part;
a cylindrical outer body part surrounding the inner body part;
and
a V-shaped groove formed in the outer circumferential surface of the inner body part and configured to transmit a cooling medium, the V-shaped groove circling helically at an oblique angle around the inner body part a plurality of times,
wherein the V-shaped groove includes a pair of side surfaces opposed to each other in a direction of an axis of rotation of the rotor, and the pair of side surfaces are directly connected to each other at a bottom of the V-shaped groove,
wherein the pair of side surfaces extend from the bottom of the V-shaped groove to the outer circumferential surface of the inner body part,
wherein the inner body part has a virtual region being cylindrical about the axis of rotation, the virtual region having an outer diameter bounded by the bottom of the V-shaped groove,
wherein each of the side surfaces is formed having a draft angle that inclined away from each other, the draft angle determined relative to a direction orthogonal to the axis of rotation, and
wherein the draft angle is larger than the oblique angle of the V-shaped groove, and is derived using formula (1) under the condition of formula (3),
[
Formula
⁢
⁢
1
]
atan
⁡
[
(
D
⁢
⁢
1
-
D
⁢
⁢
2
)
/
2
⁢
⁢
tan
⁢
⁢
S
D
⁢
⁢
1
/
2
⁢
⁢
sin
⁢
{
acos
⁡
(
D
⁢
⁢
2
/
D
⁢
⁢
1
)
}
]
atan
⁡
(
P
π
⁢
⁢
D
⁢
⁢
1
)
>
1
⁢
[
Formula
⁢
⁢
3
]
(
1
)
(
D
⁢
⁢
1
-
D
⁢
⁢
2
)
⁢
tan
⁢
⁢
S
<
P
(
3
)
where S is the draft angle, D1 is the outer diameter of the inner body part, D2 is the outer diameter of the virtual region, and P is an array pitch of the V-shaped groove in the direction of the axis of rotation.

109 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/133,628Filed 24 Dec 2020 · continuation
Priority: JP 2018-12292628 Jun 2018
Published: US 2021/0115925 A122 Apr 2021
Granted: 17 Oct 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification19 codes

F04D 29/5806
Cooling ; Heating; Diminishing heat transfer: cooling the drive system
F04C 29/04
Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00: heating; Cooling ;…
F04D 25/06
Units comprising pumps and their driving means: the pump being electrically driven
F04D 29/584
Specially adapted for elastic fluid pumps: cooling or heating the machine